Not until all the fish died in the lake __________ how serious the pollution was.
The chairman thought ______ necessary to invite Professor Smith to speak at the meeting.
There are the books ______ my brother.
There is no need for you to look up every new word you _____ when reading. You have to learn how to guess the meanings of new words according to the context.
—What did John say about leaving the city?—He said he disliked the place so he had no _____ about leaving so soon.
There is still much to discuss. We shall, _____ return to this item at our next meeting.A. therefore B. however Cotherwise D.briefly